Display screen or portion thereof with graphical user interface morphing window controls



FIG. 1 is a front view of a first image in a sequence for a display screen or portion thereof with a with graphical user interface morphing window control according to a first embodiment of our design;

FIG. 2 is a front view, showing a second image thereof;

FIG. 3 is a front view, showing a first image in a sequence for a display screen or a portion thereof with a graphical user interface morphing window control according to a second embodiment of our design;

FIG. 4 is a front view, showing a second image thereof;

FIG. 5 is a front view, showing a third image thereof;

FIG. 6 is a front view, showing a first image in a sequence for a display screen or a portion thereof with a graphical user interface morphing window control according to a third embodiment of our design; and,

FIG. 7 is a front view, showing a second image thereof.

The appearance of the image transitions sequentially between the images shown in each respective embodiment. The process or period in which an image transitions to another forms no part of the claimed design.

The broken lines showing portions of a display screen, text, background imagery and other features in the figures are environmental only and form no part of the claimed design. Stipple fill areas illustrate a contrast in appearance. 

CLAIM The ornamental design for a display screen or portion thereof with graphical user interface morphing window controls, as shown and described. 